Accumulated Other Comprehensive Income (loss) (Detail) - USD ($) $ in Thousands	12 Months Ended
	May 31, 2023	May 31, 2022	May 31, 2021
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	$ 1,983,828	$ 1,743,025	$ 1,264,663
Ending Balance	2,143,000	1,983,828	1,743,025
Foreign Currency Translation Adjustments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(395,473)	(300,365)	(440,732)
Current period comprehensive income (loss)	(71,772)	(98,834)	148,360
Income taxes associated with current period comprehensive (loss) income	1,870	3,726	(7,993)
Ending Balance	(465,375)	(395,473)	(300,365)
Pension And Other Postretirement Benefit Liability Adjustments, Net of Tax
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(153,383)	(190,610)	(277,717)
Current period comprehensive income (loss)	(12,242)	31,802	80,949
Income taxes associated with current period comprehensive (loss) income	2,785	(7,763)	(19,395)
Amounts reclassified from accumulated other comprehensive income (loss)	18,363	17,276	33,035
Income taxes reclassified into earnings	(4,287)	(4,088)	(7,482)
Ending Balance	(148,764)	(153,383)	(190,610)
Unrealized Gain (Loss) On Derivatives, Net of Tax
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	13,171	(23,982)	(71)
Current period comprehensive income (loss)		60,669	(43,703)
Income taxes associated with current period comprehensive (loss) income		(14,491)	10,281
Amounts reclassified from accumulated other comprehensive income (loss)	(1,766)	(12,097)	12,616
Income taxes reclassified into earnings		3,072	(3,105)
Ending Balance	11,405	13,171	(23,982)
Unrealized Gain (Loss) On Securities, Net of Tax
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(1,652)	73	1,023
Current period comprehensive income (loss)	(482)	(1,785)	(1,052)
Income taxes associated with current period comprehensive (loss) income	4	3	(89)
Amounts reclassified from accumulated other comprehensive income (loss)	(67)	59	268
Income taxes reclassified into earnings	(4)	(2)	(77)
Ending Balance	(2,201)	(1,652)	73
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(537,337)	(514,884)	(717,497)
Current period comprehensive income (loss)	(84,496)	(8,148)	184,554
Income taxes associated with current period comprehensive (loss) income	4,659	(18,525)	(17,196)
Amounts reclassified from accumulated other comprehensive income (loss)	16,530	5,238	45,919
Income taxes reclassified into earnings	(4,291)	(1,018)	(10,664)
Ending Balance	$ (604,935)	$ (537,337)	$ (514,884)